> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/pt-br/web/xss/reflected-xss-in-html-with-blocked-tags.md).
# XSS Refletido em HTML com Tags Bloqueadas
Notas sobre XSS Refletido em HTML com Tags Bloqueadas para laboratórios da PortSwigger Web Security Academy, incluindo fluxo de exploração, teste de payloads, validação no Burp Suite e contexto de remediação.
### XSS refletido em contexto HTML com a maioria das tags e atributos bloqueados
Este laboratório contém uma vulnerabilidade de XSS refletido na funcionalidade de busca, mas um firewall de aplicação (WAF) bloqueia os vetores de XSS mais comuns. / Para resolver o laboratório, você deve contornar o WAF e acionar o `print()` função.
* Tentando payloads clássicos como `
test
`, `test
* Interceptei a página com o Burp Suite e disparei um mailing via Intruder.
Copiei os tipos de atributos de evento (manipuladores de evento) e testei vários deles na cheatsheet do PortSwigger.
* J
```
```
* Filtrei/testei vários atributos de eventos e me concentrei em `onresize`.
```javascript
```
Payload testado e funcionando:
* Injeção direta: `` — ao redimensionar (roda de zoom), o alerta aparece.
Objetivo final: chamar `print()` em vez de `alert()`:
```javascript
```
URL do exploit enviada à vítima:
```javascript
https://0a8500230379f8e980d8032300850075.web-security-academy.net/?search=
```
Entrega via iframe e disparo automático:
* Para forçar o `onresize` evento a carregar no frame, a largura do frame é alterada a partir de seu `onload` atributo:
{% code overflow="wrap" %}
```javascript
```
{% endcode %}
Resumo: bypass do WAF ao injetar um atributo de evento permitido (`onresize`) que chama `print()`, depois entrega via iframe com `onload` que altera o tamanho para disparar `onresize`.
---
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